Friction between the projectile and fabric has a positive effect on fabric energy absorption by influencing the number of yarn strands that become involved in dispersing the energy . nanoTarge increases the friction between the projectile and fabric through the millions of nanoparticles adhering to the individual fibers; thus increasing the likelihood of more yarn involvement in absorbing the projectile strike.
A 2003 U.S. Army sponsored study determined that the hardness of particles entrained in a Kevlar fabric contribute to the puncture and ballistic resistance.  The nanoparticles of nanoTarge are significantly harder than the silica particles used in the study.
 A numerical investigation of the influence of friction on energy absorption by a high-strength fabric subjected to ballistic impact
Y. Duan, M. Keefe, T.A. Bogetti, B.A. Cheeseman, and B. Powers
 Effect of Particle Hardness on the Penetration Behavior of Fabrics Intercalated with Dry Particles and Concentrated Particle-Fluid Suspensions
Dennis P. Kalman, Richard L. Merrill, Norman J. Wagner, and Eric D. Wetzel
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